Centrifuges

The oil driven centrifuge is one of the most reliable and economical oil cleaning technologies in the industry.




Are you throwing away perfectly good oil because of worries about contamination? There is a smarter solution….enabling you to minimise your lube expenditure while maintaining optimal operating conditions for your machine by cleaning your oil with a centrifuge.

COS offers you a way to constantly remove impurities from your oil while the machine is running. The result is oil you can use for longer with no machine downtime for oil changes. The oil centrifuge offers a highly effective fleet solution to reduce running costs. Originally designed for engines, its use has expanded to all types of applications that require contamination control.

Oil Centrifuge Filtration is renowned for maintaining pristine lubricant condition by constantly removing the soot and other contamination particles as the engine operates, thus maintaining a much cleaner condition than can be achieved by normal filtration.

How Oil Centrifuge Filtration Works



Oil circulates from your machine into the centrifuge in a dialysis system. Inside the centrifuge, an oil driven rotor spins at high speeds of up to 7000 rpm. The resulting gravitational force draws any particles outwards while the purified oil passes back into your machinery. This way, soot and other contaminants are continually removed during normal engine operation. You then remove the contamination when you periodically clean the rotor.

The dirt holding capacity of the rotor is well beyond that of a comparable sized element with the rotor being washable and re-usable - less taxing on the environment by reducing land fill. While the centrifuge is not a filter, it is not limited to the same integrity size rating as a filter element. This means it can remove particles to sub micron levels. On the other hand it is ineffective at start up until the fluid has warmed and the rotor has reached high speed.

The centrifuge creates gravitational forces within the rotor which cause the more dense contamination particles to migrate to the outer perimeters of the rotor shell. As the oil's return path is toward the centre of the rotor, where the 'G' forces are less, the particles remain trapped in the high 'G' area where they are removed at a later date when the rotor is cleaned.

For the particle to be removed, it must be denser than the flowing oil. Consequently the additive package of the oil will not be affected unless it too is denser than the rest of the lubricant. If this were the case, the additives would settle on standing which would be detrimental to the quality of most oils. This is the case in a small number of lubricants such as those containing Molybdenum Disulphide which will settle on standing and consequently cannot be cleaned in the oil centrifuge. The molybdenum, being a heavier metal will be removed.

The centrifuge comes in many models and is adaptable to most sized diesel engines. It is a highly regarded device sought by many engine OEM's. Caterpillar, Mack, Cummins, MTU and Scania all use and/or supply them for their equipment and large Wartzilla engines have centrifuges fitted as standard. Most engine oil filters are rated at around 30 um which is about half the size of a fine hair. Any particle smaller than 30um will consequently stay in circulation causing gouging and wear on components as it is carried around the system as it operates. Soot particles are likened to dust and usually run around 0.5 to 2um in size. Their abrasive ability is likened to dust and they consequently cause higher wear rates. The centrifuge is well known to constantly remove soot particles and hence reduce wear.


Centrifuges are available in many sizes to fit all different sized engines. See the following guide:



Model
Flow Rate
Engine Sumps
Dirt Holding Capacity